It's not a big deal to clean a bigger hookah in the sink. What I do is to plug one end of the stem with my finger and fill it with water through the other end. I do this 2-3 times. After that I wet the brush and go through the stem from both ends a couple of times. After this I do what I did in the beggining, plug one end with my finger and rinse it out from the other end. It works just as good as when you let water go through the stem. Just this way you don't need to clean it in the bath, or anywhere else where you have more room.